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JUSTER DC-691PA SPEAKERS USE AN AC WALL ADAPTER. DO YOU KNOW THE POWER REQUIRMENTS FOR THIS SYSTEM?

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Computer Speakers Juster (External, Powered), (Adapter, 9V, -Outer, +Center) JusterDC-691PAYZNJ891701998

Posted on Sep 08, 2010

  • Ted Cantrall
    Ted Cantrall Jul 11, 2015

    I just took apart my JUSTER DC-691PA speakers to look at the power circuit. The power input jack feeds a 4-diode bridge followed by a 1000uF, 18v filter cap. This suggests to me that an AC power input is expected. Moreover, the 9v DC would be attenuated by the diodes down to about 7.8 volts. Whereas, if 9V AC (RMS) were used, the filtered DC would be in the 10 to 12 volt range, depending on load.

    Any ideas there?

    -ted-

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Hope this initial info/idea helps.

Let me know for any clarifications.

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